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Title: InGaP quantum nanophotonic integrated circuits with 1.5% nonlinearity-to-loss ratio
Optical nonlinearity plays a pivotal role in quantum information processing using photons, from heralded single-photon sources and coherent wavelength conversion to long-sought quantum repeaters. Despite the availability of strong dipole coupling to quantum emitters, achieving strong bulk optical nonlinearity is highly desirable. Here, we realize quantum nanophotonic integrated circuits in thin-film InGaP with, to our knowledge, a record-high ratio of 1.5 % between the single-photon nonlinear coupling rate ( g / 2 π = 11.2 M H z ) and cavity-photon loss rate. We demonstrate second-harmonic generation with an efficiency of 71200 ± 10300 % / W in the InGaP photonic circuit and photon-pair generation via degenerate spontaneous parametric downconversion with an ultrahigh rate exceeding 27.5 MHz/µW—an order of magnitude improvement of the state of the art—and a large coincidence-to-accidental ratio up to 1.4 × 10 4 . Our work shows InGaP as a potentially transcending platform for quantum nonlinear optics and quantum information applications.  more » « less
Award ID(s):
1839177
PAR ID:
10352677
Author(s) / Creator(s):
;
Date Published:
Journal Name:
Optica
Volume:
9
Issue:
2
ISSN:
2334-2536
Page Range / eLocation ID:
258
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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